Steam-generator and furnace



(No Model.)

D. HURST.' STEAM GENERATOR AND FURNACE.

No.4Z 3 ,518. PatentedMar. 18,1890.

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' UNITED STATES PATENT OFFICE.

DAVID-BURST, or MANSFIELD, onto.

STEAM-GENERATOR AND FURNACE.

SPECIFICATION forming part of Letters Patent No. 423,518, dated March 18, 1890.

Application filed September a, 1889. Serial No. 322,840. (in model.)

To all whom it may concern:

Beit known that I, DAVID HURST, of Mansfield, in the county of Richland and State of Ohio, have invented certain new and useful Improvements in a Steam-Generator and Inclosed Furnace; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same.

My invention relates to improvements in a V steam-generator and inclosed furnace in which a steam-pipe is coiled around the firebox to superheat the steam,- such superheated steam being introduced in a jet into the airsupply pipe to induce an air-blast, such blast being directed upon the top of the fuel, to the end that better results and more perfect combustion are attained than with steam-generating devices as heretofore constructed.

My invention also relates to the details of construction hereinafter described, and pointed out in the claims.

right variety, such boiler having an inside Wall A extending from top to bottom of the boiler and inclosing a tapering combustionchamber A The boiler rests upon base B, the latter having a central circular opening large enough to admit the assembling of the fire-pot, grates, &c. Y

O is a flat ring having a flange C extending under the base, to which latter ring 0 is secured. To this ring are hinged doors 0 for excluding air from below to the grates. These doors may have counter-balances c, for bold ing the doors in a horizontal or closed position, these doors opening downward when it is desired to remove the ashes from the grate. Upon ring O rest legs 0 that support the fire-pot D. The fire-pot is circular in form, but is flared at the upper end thereof to ap proximately fit the opposing boiler walls, there being considerable space between the lower or reduced section of the fire-pot and the boiler. The fire-pot is usually provided at D with a lining of fire-brick or other suitable refractory material; The grate E rests on and is connected with post E, the latter resting in a depressed seat on cross-bar or by means of brackets b, depending from the base B, the latter being supported by suitable mason-work. Post E is provided with a lateral hole e, for inserting a shaker, the grates being shaken by oscillating the post on its axis.

G is an inverted funnel-shaped hood covering the upper end of the boiler, this hood connecting with smoke-pipe G.

H is an outside casing or jacket inclosing the boiler and hood, the air-space inclosed by this casing being somewhat larger in lateral dimensions adjacent the hood. This casing above connects with drum 1, the latter being open-ended below. The upper end of the drum is provided with a head fitting closely around the smoke-pipe. This drum is provided with a damper 2', of large size, for admitting air, the principal air-supply being admitted through this damper; also, dampers h are provided near the bottom of the casing for admittingalimited supply of air between the casing and boiler, such limited air-supply being intended to prevent the casing from overheating, and hence preventing in a great measure the waste of heat by radiation, and at the same time this limited air-supply, being heated and afterward mingling with the air supply from damper i, helps to increase the temperature of the air provided for supporting combustion; also, to this end the smokepipe, extending through drum I and the hood,

inclosed as aforesaid, all tend to the same result.

J is a spider having hollow arms, the openings in these arms registering with openings 9 in the hood, to which latter the spider is secured.

K is an air-pipe connecting with the spider, the latter having a centralorifice through the lower wall thereof, such orifice discharging into pipe K. The latter is preferably shaped approximately, as shown, being offset toward the lower end, the extreme lower end below the offset being located centrally within the combustion-chamber and terminating a short distance above the fuel in the fire-pot.

L is a steam-pipe connecting with the steam space of the boiler and leading from thence under the boiler and from thence leading up outside the fire-pot, the pipe being coiled around the fire-pot, as shown, and the coilsection of the pipe being, preferably, of copper. The convolutions of the pipe are supported by means of lugs d, projecting exterrally from the fire-pot. From the coil-section pipe L leads upward and is then returned downward, the depending section of the pipe passing into the air-pipe and discharging centrally into the lower sectionof the airpipe, By reason of pipeL being coiled around the fire-pot and such coiled section being of copper, the heat-transmitting properties of the copper being well known, the steam, passing through pipe L, becomes superheated to a high degree, and in such condition is discharged in a downward jet into the air-pipe, thereby inducing a strong air-blast through the air-pipe. The blast directedupon the fuel produces such intense heat that the combustion is perfect, the gases being entirely consumed, so that no smoke is formed. In place of live steam from the boiler, exhauststeam may be used for the purpose.

Door M leads to the combustion chamber directly above the fire-pot.

What I claim is 1. The combination, with upright boiler fire-pot, and air-supply pipe, the latter being located within the combustion-chamber and discharging toward the fuel, of steam-pipe coiled around the fire-pot, such steam-pipe discharging downward inside the air-supply pipe, substantially as set forth. I v

2. The combination, with upright boiler, fire-pot, air-supply pipe, substantially as indicated, of hood inclosing the upper end of the boiler, such hood connected with the smoke-pipe, a jacket inclosing boiler and hood, dampers in the jacket for admitting air, and a hollow-armed spider'located inside the hood and connecting with openings in the latter, such spider being connected with the air-supply pipe and having an opening discharging into the latter, substantially as set forth. v

In testimony whereof I sign this specification, in the presence of two witnesses,this 25th day of May, 1889.

DAVID HURST. Witnesses: I

J NO. MARSHALL, H. P. SEWELL. 

